Presser-foot mechanism for sewing machines



Oct. 29, 1929. H, REED 1,733,515

PRESSER FOOT MECHANISM FOR SEWING MACHINES Original Filed Nov. 11. 1922[Va/enforc/Qzfio rneys.

Patented Oct. '29, 1929 UNITED STATES PATENT OFFICE? JAMES 311mmSWAMPSCOTT, MASSACHUSET assrenon, Y MESNE ASSIGN- MENTS, TO UNITED snonMACHINERY conronarron, or rArnnson, "NEW ma SEY, A CORPORATION OF NEWJERSEY PRESSER-FOOT MECHANISM, non snwrive'ivmcnmns' Originalapplication filed November 11, 1922, Serial 1705600324. Divided and thisapplication filed October 20, 1923. Serial 'No'. 669,829.

This invent-ion relates to presser-foot mechanism and especially,although. not exclusively, to presser-foot mechanism for lock stitchshoe sewing machines of the general type shown in Patent No. 1,482,619dated February 5, 1924:, and in my prior application for Letters Patent,Serial No. 542,666, filed March 10, 1922, on which Patent No. 1,688,056issued October 1.6, 1928, the present application being a division ofapplication Serial No. 600,224, filed November 11, 1922, on which PatentNo. 1,706,743 issued March 26, 1929. p

This invention has for its object to provide 5 improved presser-footoperating means of such a character as to insure the lifting of thepresser-foota constant distance above the work irrespective of thethickness of the lat.-

ter.

This and other objects of the invention, together with means whereby thesame may be carried into elfectfwill best be understood from thefollowing description of'a preferred embodiment thereof illustrated inthe accom- 25 panying drawings, in which--- bodied in a machine of thetype described in my prior application above referred to. Said machineis adapted primarily for sewing r shoes of the McKay type, but is alsocapable of use for many other purposes, as, for eX- ,45 ingwork-supporting horn 17 having in its The invention is hereinillustrated asemtipanoscillating looper or whirl l8 supplya cop orneedle thread I The needle is carried by a needle bar 19 which isconnected by a link 20 with a lever 21 pivoted in the head frame/22 andoper ated by a cam 23 on the main shaft 24 Journalled in said head frame22 and adapted to receive'powerfrom any suitable source.

The shuttle 16 is'of the discodial type and ismounted ina shuttle race27 supported at the bottom ofthe head frame 22 ina position to hold theshuttle with its front face slightly inclined to the path of the needle.The shuttlehas a hook 28 projecting from its front face and extendingcircumferentially there of, the arrangement being such that, as theshuttle is oscillated, said hookwill cross the] path of the needle, takethe loop therefrom, and'cast the same over the shuttle," said hookpassing at one side of the path of'the needle when in its uppermostposition.- 7

.Thefwhirl 18 is oscillated, by mechanism not shown herein, to place aloop of cop threadin the openhook ofthe needle 15 when the latter is inits lowermostposition, said loop being taken from] the needle,when thelatter rises, by the shuttle 16, and the'shuttle a 7 thread beingexplained. s

Between i the formation of, successive stitches, t he work is fedforwardly by means of a four-motion feed point'or and 42 The parts thusfar referred to, exceptas theyenter into combination with the partshereinafterdescribed,-f specifically form no portion of the presentinvention andmay be of any suitable construction and l arrangement. Theywill, therefore, not be further discussed herein, as theyare fully shownand described in my priorfapplication above referred to, andtheforegoing explanation of their nature and function will besufiicient fora completeunderstanding ,ofvthe inven* tion about to be described. I

'1- The work W is,duringthe stitch-forming passed tl1erethrough,as aboveoperations, clamped upon the work-supporting horn 17 by a presser-foot34 carried by a presser-foot bar 35 guided for vertical movement in thehead frame 22. Said 1 presser foot is pressed toward the work by atorsion spring 86 carried by a rod 37 supported at its ends in brackets38 and 39 secured to the top of the head frame 22, said cam'23. Thearrangement is such that, when the dog 44 is raised by the lever 45, itwill first turn upon its pivot to engage the presser foot barwith'a'clamping pressure,the slide 43 bein then lifted by the lever 45,acting through the dog 44,.and carrying with it the presser foot bar. Asthe dog 44 is released by the lever 45, it will,'-in' turn, release thepresser foot bar35,:permitting the spring 36 to depress the latter, theslide43 being independently depressed by a spring 46 to an extentdetermined by the engagement of an adjusting screw 47 carried by saidslide with an adjacent portion of the head frame 22. The stroke of thelever being constant, it will be seen that the movement imparted tothesl'ide 43 will depend upon the adjustment of the screw 47 being,however, constant in amount for each adjustment of said screw. The slide43 and dog 44 constitute an intermittent grip device which cooperateswith the presser-footbar 8 5t'0 lift the latter a predetermined amount,irrespective of the initial position of said bar, this amount" beingequal to the amount of movement of said slide It will,therefore,'be seenthat, irrespective of thethickness of the work W, the

' presser-foot 34 will at each operation of the machine be lifted thesame distance above the upper surface of the work, this amount beingdetermined by adjustment of the screw 47. 1

Thepresser-foot maybe lifted vby the op- I erator in order to permit theinsertion or V removal of the work by means of a lever 48 fulcrumed uponthe bracket 39 and engagmgr at its forward endan opening. in the presserfootbar3'5, said lever being operated through suitable connectionsbya'treadle not shown):- at the base of the machine. 7

Having thus described my invention, I claim:

In a sewing machine, in combination, a work s'upport, a? head frame, anoperating shaft j'ournalled in said fra1ne,as presserfoot bar guidedyinsaidfr'ame, a; presser foot. carried thereby and: cooperating; with saidwork'support, a s'lide guided 'On"said presser- 7 JAMES H. REED.

